summaryrefslogtreecommitdiff
path: root/include/trace
diff options
context:
space:
mode:
authorZheng Liu <wenqing.lz@taobao.com>2013-02-18 00:29:59 -0500
committerTheodore Ts'o <tytso@mit.edu>2013-02-18 00:29:59 -0500
commitd100eef2440fea13e4f09e88b1c8bcbca64beb9f (patch)
tree2451dc4582b43a30b414c89108b75148d48c9b57 /include/trace
parentf7fec032aa782d3fd7e51fbdf08aa3a296c01500 (diff)
ext4: lookup block mapping in extent status tree
After tracking all extent status, we already have a extent cache in memory. Every time we want to lookup a block mapping, we can first try to lookup it in extent status tree to avoid a potential disk I/O. A new function called ext4_es_lookup_extent is defined to finish this work. When we try to lookup a block mapping, we always call ext4_map_blocks and/or ext4_da_map_blocks. So in these functions we first try to lookup a block mapping in extent status tree. A new flag EXT4_GET_BLOCKS_NO_PUT_HOLE is used in ext4_da_map_blocks in order not to put a hole into extent status tree because this hole will be converted to delayed extent in the tree immediately. Signed-off-by: Zheng Liu <wenqing.lz@taobao.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Cc: Jan kara <jack@suse.cz>
Diffstat (limited to 'include/trace')
-rw-r--r--include/trace/events/ext4.h56
1 files changed, 56 insertions, 0 deletions
diff --git a/include/trace/events/ext4.h b/include/trace/events/ext4.h
index c121cdf55ab3..1e590b68cec4 100644
--- a/include/trace/events/ext4.h
+++ b/include/trace/events/ext4.h
@@ -2199,6 +2199,62 @@ TRACE_EVENT(ext4_es_find_delayed_extent_exit,
__entry->pblk, __entry->status)
);
+TRACE_EVENT(ext4_es_lookup_extent_enter,
+ TP_PROTO(struct inode *inode, ext4_lblk_t lblk),
+
+ TP_ARGS(inode, lblk),
+
+ TP_STRUCT__entry(
+ __field( dev_t, dev )
+ __field( ino_t, ino )
+ __field( ext4_lblk_t, lblk )
+ ),
+
+ TP_fast_assign(
+ __entry->dev = inode->i_sb->s_dev;
+ __entry->ino = inode->i_ino;
+ __entry->lblk = lblk;
+ ),
+
+ TP_printk("dev %d,%d ino %lu lblk %u",
+ MAJOR(__entry->dev), MINOR(__entry->dev),
+ (unsigned long) __entry->ino, __entry->lblk)
+);
+
+TRACE_EVENT(ext4_es_lookup_extent_exit,
+ TP_PROTO(struct inode *inode, struct extent_status *es,
+ int found),
+
+ TP_ARGS(inode, es, found),
+
+ TP_STRUCT__entry(
+ __field( dev_t, dev )
+ __field( ino_t, ino )
+ __field( ext4_lblk_t, lblk )
+ __field( ext4_lblk_t, len )
+ __field( ext4_fsblk_t, pblk )
+ __field( unsigned long long, status )
+ __field( int, found )
+ ),
+
+ TP_fast_assign(
+ __entry->dev = inode->i_sb->s_dev;
+ __entry->ino = inode->i_ino;
+ __entry->lblk = es->es_lblk;
+ __entry->len = es->es_len;
+ __entry->pblk = ext4_es_pblock(es);
+ __entry->status = ext4_es_status(es);
+ __entry->found = found;
+ ),
+
+ TP_printk("dev %d,%d ino %lu found %d [%u/%u) %llu %llx",
+ MAJOR(__entry->dev), MINOR(__entry->dev),
+ (unsigned long) __entry->ino, __entry->found,
+ __entry->lblk, __entry->len,
+ __entry->found ? __entry->pblk : 0,
+ __entry->found ? __entry->status : 0)
+);
+
#endif /* _TRACE_EXT4_H */
/* This part must be outside protection */